:root{--bg:#f5f6fa;--ink:#232d42;--text:#4a5468;--line:#eceef4;--link:#3a57e8}
@media (prefers-color-scheme:dark){:root{--bg:#10141f;--ink:#e9ecf5;--text:#c5cbd8;--line:#2b3346;--link:#8fa2ff}}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:1.5rem 16px 3rem}
h1,h2{color:var(--ink);line-height:1.25}h1{font-size:1.7rem;margin:.6rem 0}h2{font-size:1.15rem;margin:1.6rem 0 .4rem}
a{color:var(--link)}.lead{font-size:1.08rem;color:var(--ink)}.top{font-size:.95rem}
li{margin:.35rem 0}hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}